光照刺激时间对肉种鸡性成熟的影响

doi:10.11843/j.issn.0366-6964.2017.11.012

Abstract

Abstract:

This work studied the effect of age at photostimulation (PS) on sexual maturation in broiler breeders, aiming at providing scientific guidance for the lighting management. A total of 384 healthy female AA broiler breeders were randomly assigned to 4 treatments with 2 replications, respectively. The birds were caged individually and provided with restricted feed. The birds of the 4 treatments were photostimulated at 16 (PS16), 18 (PS18), 20 (PS20) and 22 (PS22) weeks of age, respectively. In the first week of photostimulation, the lighting regimen was 8L:16D and the lighting intensity was increased from 10 to 80 lx. From the 2nd to the 4th week of photostimulation, the lighting regimen was changed from 8L:16D to 14L:10D. Six birds randomly selected from each treatment were sacrificed to characterize the growth, sexual development at 4 time points (the week before the photostimulation, and 2, 4, and 6 weeks after the photostimulation). Blood samples were collected to measure the plasma esteadiol concentration. The egg production was recorded for each bird. The qualities of the eggs in the early laying period were estimated. The results showed that:1) The birds in all treatments had increased abdominal fat percentage. The PS20 and PS22 birds had the faster increase in ovary index, oviduct index, oviduct length and estradiol levels than those from the PS16 and PS18. 2) The time from the first egg to 5% production and from photostimulation to 5% production of birds of PS16 were both longer than other treatments (P=0.007 9, P=0.000 1). 3) Birds from the PS18 had a lighter eggshell weight than those from PS16 and PS22 (P=0.005 1). Shell thickness and strength were higher for the birds from the PS16 than those from other treatments with no significant difference (P=0.083 4, P=0.066 2). In addition, Age of photostimulation had no effect on other egg quality parameters (P>0.05). In conclusion, photostimulation at 16 weeks of age for female broiler breeders may cause the light desensitization; photostimulation at 22 weeks may promote the sexual maturation, including gonad development, estradiol levels, laying uniformity, and egg quality in the early laying period.

CLC Number:

S831.2

SHI Lei, SUN Yan-yan, XU Hong, LIU Yi-fan, XU Song-shan, LI Yun-lei, YE Jian-hua, CHEN Chao, LI Dong-li, CHEN Yu, GUO Yan-li, CHEN Ji-lan. Effect of Age at Photostimulation on Sexual Maturation in Broiler Breeders[J]. ACTA VETERINARIA ET ZOOTECHNICA SINICA, 2017, 48(11): 2107-2114.

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Effect of Age at Photostimulation on Sexual Maturation in Broiler Breeders

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